$40: Especially elaborate work. (The entire cast of Glee as ponies in the style of Botticelli, for example.)

$30: Normal job. Default. Unless you specify otherwise, a yellow-envelope-sized acrylic painting seen only by you. (Maybe a birthday present for your girlfriend of Scooby Houndoo and pokemaster Shaggy sipping slushies at Lavender town about to get marrowak'd. Just a thought.)

$20: Easier job. Something that doesn't need a background or a lot of color. (A page of malformed wacom-drawn Sonics or perhaps a caricature of your dog.)

$other: Want a new installment of Sweet Bro n' Jeff made in a half hour for 3 bucks and a sandwich? It's a low-risk investment! Want a faithful feature length trilogy version of Tales of Worm Paranoia for 4000 rupees? I'd drop classes for that! (But communication is key. Just saying "can I have a sketch of something?" will make me think you're not done talking. And with no comment on your payment or format preference, it will default to a $30 painting.)